DISASSEMBLY
1.Disconnect the radiator fan motor connector.2.Set the temperature of the heater control to the hot position.3.Loosen the radiator drain plug to drain coolant.4.Disconnect the upper and lower hose and overflow tube.5.For vehicles with automatic transmission, disconnect the oil cooler hoses from the automatic transmission.
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Plug the ends of the oil cooler hoses and the automatic transmission fittings to prevent transmission fluid from spilling out and foreign material from entering.Remove the radiator mounting bolts.7.Remove the radiator together with the fan motor.8.Remove the fan motor from the radiator.

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Not fimiliar with commodore engineering (im from the US, we dont have those!) but follow the upper radiator hose to where it connects to the engine, theres the thermostat. Remove everything thats in the way of removal, swap the thermostat then reassemble. Sorry if this is to vague to help, but for some people, this would be the only clue they need to just hop into it!

You might need to change the ECM (computer) and you may be able to put in an oil cooler instead of changing the radiator.
Another way to go would be to contact your local automotive junk yard
and purchase a wrecked vehicle that is the same as yours except
automatic. The vehicle would need to be damaged in a way that doesn't
effect the parts you are interested in. You would then have everything
needed to swap over including peddle assembly, steering column or
console, linkages, wiring, switches, cross-member, flywheel, driveshaft,
correct speedometer gears, cooling lines, radiator and so on.

Steps:Step 1 With the engine off and cold, open the hood and locate the vehicle’s water pump.o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.o Tip: Before removing the radiator cap, squeeze the upper radiator hose to verify that the cooling system is not pressurized.

Step 2 Remove the radiator cap.

Step 3 Install cooling system pressure tester. Apply the pressure indicated on the radiator cap or in the owner’s manual.

Step 4 Inspect cooling system components for leaks.

Step 5 Place a drain pan under the radiator. Open drain valve or remove the lower radiator hose to drain cooling system.o Tip: Depending on the vehicle, lifting the vehicle may be required to gain access to the lower radiator hose.

Step 6 Remove the drive belts or serpentine belt.

Step 7 Remove any hoses connected to water pump.

Step 8 Unbolt water pump from engine. Remove the water pump.

Step 9 Using a gasket scraper, clean the mating surface on the engine block.

Step 10 Install new water pump and new gasket. Tighten bolts to manufacturer’s specifications.o Tip: You may want to use a light bead of silicone designed for water pumps.

Step 11 Re-install any hoses and belts that were removed.

Step 12 Re-install drain plug or lower radiator hose.o Tip: Squeeze the radiator hose. If it feels soft you may want to replace the hose at this time. Always use new hose clamps.

Step 13 Refill radiator with a 50/50 mix of coolant and distilled water, then pressure test the cooling system and check for leaks.

Step 14 Fill overflow reservoir with same mixture.

Step 15 Leave the radiator cap off, start engine and let it idle. You should see the system“burping” bubbles of air. Refill the radiator to the top. o Tip: Most air is expelled after a couple minutes of idling. Be cautious of potentially hot fluid overflowing.

Step 16 Install radiator cap.

Step 17 Road test vehicle, keep an eye on the engine temp gauge if vehicle runs hot, there still might be an air pocket in the cooling system. The cooling system should be topped off after vehicle has fully cooled down.

The radiator, motor mounts, throttle cable, kickdown cable maybe, exhaust Y pipe and probably the computer. These will have to come from the 350. Also check out faxonautoliterature before you start. They list 2 different manuals covering GM engine swaps for $25. They would probably be a big help with part numbers and wiring. Hope this helps.